Note 5 - Fair Value of Financial Instruments - Effect of Cash Flow Hedge on Statement of Operations and Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Balance		$ 1,998,461	$ 1,941,437
Balance		2,014,849	1,949,879
Cross Currency Swap [Member] | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member]
Balance		5,745	3,366
Gain or (loss) recognized in Other comprehensive income (loss)	[1]	(8,587)	(13,900)
Amount reclassified from Other comprehensive income (loss) into earnings		6,682	11,102
Balance		$ 3,840	$ 568

[1] The amount of gain or (loss) recognized in Other comprehensive income (loss) for the years ended December 31, 2021 and 2020 is net of tax of $0.8 million and $1.1 million, respectively.